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Food
Does baking powder go bad?
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Baking powder will not go bad but it will lose its potency over time. So your cakes and other baking won't rise as they should. It's a good idea to replace old baking powder after about 1 year.
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Baking powder is a combination of baking soda, cream of tartar, and cornstarch and should last somewhere from 6 to 12 months. To test if it is okay, stir half a teaspoon baking powder into a cup of hot water. It will start to fizz if still fresh enough to use.
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